<template>
  <div>

    <el-form inline>
      <!-- 表单元素 -->
      <el-form-item>
        <el-input v-model="tempSearchObj.username" placeholder="用户名" />
      </el-form-item>
      <!-- 查询与情况的按钮 -->
      <el-button type="primary" icon="el-icon-search" @click="search">查询</el-button>
      <el-button type="default" @click="resetSearch">清空</el-button>
    </el-form>

    <div style="margin-bottom: 20px">
      <!-- 添加与批量添加按钮 -->
      <el-button type="primary" @click="showAddUser">添 加</el-button>
      <el-button type="danger" :disabled="selectedIds.length===0" @click="revomveUsers">批量删除</el-button>
    </div>

    <!-- table表格：展示用户信息的地方 -->
    <el-table v-loading="listLoading" border stripe :data="users" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" />
      <el-table-column type="index" label="序号" width="80" align="center" />
      <el-table-column prop="username" label="用户名" width="150" />
      <el-table-column prop="nickName" label="用户昵称" />
      <el-table-column prop="roleName" label="权限列表" />
      <el-table-column prop="gmtCreate" label="创建时间" width="180" />
      <el-table-column prop="gmtModified" label="更新时间" width="180" />
      <el-table-column label="操作" width="230" align="center">
        <template v-slot="{row}">
          <HintButton type="info" size="mini" icon="el-icon-user-solid" title="分配角色" @click="showAssignRole(row)" />
          <HintButton type="primary" size="mini" icon="el-icon-edit" title="修改用户" @click="showUpdateUser(row)" />
          <el-popconfirm :title="`确定删除 ${row.username} 吗?`" @onConfirm="removeUser(row.id)">
            <HintButton slot="reference" style="margin-left:10px" type="danger" size="mini" icon="el-icon-delete" title="删除用户" />
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页器 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[3, 10, 20, 30, 40, 50, 100]"
      style="padding: 20px 0;"
      layout="prev, pager, next, jumper, ->, sizes, total"
      @current-change="getUsers"
      @size-change="handleSizeChange"
    />

    <!-- 对话框的结构 -->
    <el-dialog :title="user.id ? '修改用户' : '添加用户'" :visible.sync="dialogUserVisible">
      <el-form ref="userForm" :model="user" :rules="userRules" label-width="120px">
        <el-form-item label="用户名" prop="username">
          <el-input v-model="user.username" />
        </el-form-item>
        <el-form-item label="用户昵称">
          <el-input v-model="user.nickName" />
        </el-form-item>
        <el-form-item v-if="!user.id" label="用户密码" prop="password">
          <el-input v-model="user.password" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="cancel">取 消</el-button>
        <el-button :loading="loading" type="primary" @click="addOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <el-dialog title="设置角色" :visible.sync="dialogRoleVisible" :before-close="resetRoleData">
      <el-form label-width="80px">
        <el-form-item label="用户名">
          <el-input disabled :value="user.username" />
        </el-form-item>
        <el-form-item label="角色列表">
          <el-checkbox v-model="checkAll" :indeterminate="isIndeterminate" @change="handleCheckAllChange">全选</el-checkbox>
          <div style="margin: 15px 0;" />
          <el-checkbox-group v-model="userRoleIds" @change="handleCheckedChange">
            <el-checkbox v-for="role in allRoles" :key="role.id" :label="role.id">{{ role.roleName }}</el-checkbox>
          </el-checkbox-group>
        </el-form-item>
      </el-form>
      <div slot="footer">
        <el-button :loading="loading" type="primary" @click="assignRole">保存</el-button>
        <el-button @click="resetRoleData">取消</el-button>
      </div>
    </el-dialog>

  </div>
</template>

<script>
import { cloneDeep } from 'lodash'

export default {
  name: 'UserList',
  data() {
    return {
      listLoading: false, // 是否显示列表加载的提示
      searchObj: { // 包含请求搜索条件数据的对象
        username: ''
      },
      tempSearchObj: { // 收集搜索条件输入的对象
        username: ''
      },
      selectedIds: [], // 所有选择的user的id的数组
      users: [], // 当前页的用户列表
      page: 1, // 当前页码
      limit: 3, // 每页数量
      total: 0, // 总数量
      user: {}, // 当前要操作的user
      dialogUserVisible: false, // 是否显示用户添加/修改的dialog
      userRules: { // 用户添加/修改表单的校验规则
        username: [
          { required: true, message: '用户名必须输入' },
          { min: 4, message: '用户名不能小于4位' }
        ],
        password: [
          { required: true, validator: this.validatePassword }
        ]
      },
      loading: false, // 是否正在提交请求中
      dialogRoleVisible: false, // 是否显示角色Dialog
      allRoles: [], // 所有角色列表
      userRoleIds: [], // 用户的角色ID的列表
      isIndeterminate: false, // 是否是不确定的
      checkAll: false // 是否全选
    }
  },
  mounted() {
    this.getUsers()
  },
  methods: {
    /**
     * 查询
     */
    search() {
      this.searchObj = { ...this.tempSearchObj }
      this.getUsers()
    },

    /**
     * 清空
     */
    resetSearch() {
      this.searchObj = { username: '' }
      this.tempSearchObj = { username: '' }
      this.getUsers()
    },

    /**
     * 显示添加用户的界面
     */
    showAddUser() {
      this.user = {}
      this.dialogUserVisible = true
      this.$nextTick(() => this.$refs.userForm.clearValidate())
    },

    /**
     * 保存或者更新用户
     */
    addOrUpdate() {
      this.$refs.userForm.validate(valid => {
        if (valid) {
          const { user } = this
          this.loading = true
          try {
            this.$API.user[user.id ? 'update' : 'add'](user).then(() => {
              this.loading = false
              this.$message.success('保存成功!')
              this.getUsers(user.id ? this.page : 1)
              this.user = {}
              this.dialogUserVisible = false
            })
          } catch (err) {
            console.log('addOrUpdate:', err)
          }
        }
      })
    },

    /**
     * 取消用户的保存或更新
     */
    cancel() {
      this.dialogUserVisible = false
      this.user = {}
    },

    /**
     * 删除所有选中的用户
     */
    revomveUsers() {
      this.$confirm('确定删除吗?').then(async() => {
        try {
          await this.$API.user.removeUsers(this.selectedIds)
          this.$message.success('删除成功')
          this.getUsers()
        } catch (err) {
          console.log('revomveUsers:', err)
        }
      }).catch(() => {
        this.$message.info('取消删除')
      })
    },

    /**
     * 分配角色
     */
    showAssignRole(user) {
      this.user = user
      this.dialogRoleVisible = true
      this.getRoles()
    },

    /**
     * 设置角色-保存
     */
    async assignRole() {
      const userId = this.user.id
      const roleIds = this.userRoleIds.join(',')
      this.loading = true
      const result = await this.$API.user.assignRoles(userId, roleIds)
      this.loading = false
      this.$message.success(result.message || '分配角色成功')
      this.resetRoleData()
      this.getUsers(this.page)
      if (this.$store.getters.name === this.user.username) {
        window.location.reload()
      }
    },

    /**
     * 设置角色-取消
     */
    resetRoleData() {
      this.dialogRoleVisible = false
      this.allRoles = []
      this.userRoleIds = []
      this.isIndeterminate = false
      this.checkAll = false
    },

    /**
     * 修改用户
     */
    showUpdateUser(user) {
      this.user = cloneDeep(user)
      this.dialogUserVisible = true
    },

    /**
     * 删除某个用户
     */
    async removeUser(id) {
      try {
        await this.$API.user.removeById(id)
        this.$message.success('删除成功')
        this.getUsers(this.users.length === 1 ? this.page - 1 : this.page)
      } catch (err) {
        console.log('removeUser err:', err)
      }
    },

    /**
     * 全选勾选状态发生改变的监听
     */
    handleCheckAllChange(value) {
      this.userRoleIds = value ? this.allRoles.map(item => item.id) : []
      this.isIndeterminate = false
    },

    /**
     * 角色列表选中项发生改变的监听
     */
    handleCheckedChange() {
      const { userRoleIds, allRoles } = this
      this.checkAll = userRoleIds.length === allRoles.length && allRoles.length > 0
      this.isIndeterminate = userRoleIds.length > 0 && userRoleIds.length < allRoles.length
    },

    /**
     * 自定义密码校验
     */
    validatePassword(rule, value, callback) {
      if (!value) {
        callback('密码必须输入')
      } else if (!value || value.length < 6) {
        callback('密码不能小于6位')
      } else {
        callback()
      }
    },

    /**
     * 列表选中状态发生改变的监听回调
     */
    handleSelectionChange(selection) {
      this.selectedIds = selection.map(item => item.id)
    },

    /**
     * pageSize发生改变的监听回调
     */
    handleSizeChange(pageSize) {
      this.limit = pageSize
      this.getUsers()
    },

    /**
     * 获取分页列表
     */
    async getUsers(page = 1) {
      this.page = page
      const { limit, searchObj } = this
      this.listLoading = true
      const result = await this.$API.user.getPageList(page, limit, searchObj)
      this.listLoading = false
      const { items, total } = result.data
      this.users = items.filter(item => item.username !== 'admin')
      this.total = total - 1
      this.selectedIds = []
    },

    /**
     * 获取用户的角色列表
     */
    async getRoles() {
      try {
        const result = await this.$API.user.getRoles(this.user.id)
        // console.log('getRoles:', result)
        const { allRolesList, assignRoles } = result.data
        this.allRoles = allRolesList
        this.userRoleIds = assignRoles.map(item => item.id)
        this.checkAll = allRolesList.length === assignRoles.length
        this.isIndeterminate = assignRoles.length > 0 && assignRoles.length < allRolesList.length
      } catch (err) {
        console.log('getRoles err:', err)
      }
    }
  }
}
</script>

<style scoped>

</style>
